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As mentioned above.

The model GW gives you has no relevance to whether the bolters are or are not allowed on one facing. Its the Datasheet entry that determines the type of mounting.

The bastion has;
4 Emplaced heavy bolters.

Those can be placed and positioned anywhere you like, same with fire points and access points. As they are per model basis and there is nothing stating that you cannot edit or change the bastion model.

However, if someone doesn't want to play against you because you have 4 heavy bolters on one facing then that's their choice, but generally i'd not want to play someone who takes something so small as so serious; especially given the varying power levels of current dex's.

 BoomWolf wrote:
Its no real disadvantage, the singular HB per side provides no meaningful defense anyway, while the quad does.
You are trading 4 sides of no practical defense to three undefended side and one properly defended side of your choice (guess where that will be facing)

You make a good point, but at the same time, you simply can't say that a disadvantage is NOT a disadvantage simply because the advantage outweighs it. You may get something more out of a change but a disadvantage is always a disadvantage. For example, what if you deploy first, your 4 forward facing HB's, then they deploy on your flank, seize and flatout and are now out of LoS of those 4 HB's? you are now disadvantaged irrelevant of how strong the trade off advantage was.

OP;

Buy the bastion, modify it so the HB's are all on the same side, make it look good

use the custom terrain rules, give it the same rules as the bastion and same points cost.

There is absolutely nothing RAW or RAI wrong with that. The rules for the bastion give no definition of where the guns must be emplaced, as far as i know none of the terrain datasheets ever specify where the guns go and are all per model basis. Even firing and access points are per model basis, allowing you to use custom terrain rules.